Per T113094: [EPIC] The Page Summary API needs to provide useful content for the majority of articles, you'll find the spec for the Page Summary API here: https://www.mediawiki.org/wiki/User:Phuedx_(WMF)/Reading/Web/Page_Preview_API
AC
- The "For a disambiguation page" case is handled by the Page Summary API.
Plan (YMMV)
- If the page is a disambiguation page, then request the first N links from the page using API:Links.
- Make N configurable.